Artificial tooth or crown and fastening means therefor



June 22 1926. 1,589,994

7 A. K. SIMMONS ARTIFICIAL TOOTH on snow AND FASTENING mums THEREFOR Filed August 24, 1922 [n yen or 1445950 KjM O/VS Patented June 22, '1926.'

usa es UNITED STA E O F FIC-E.

ALrnEn K. sI 'IvIo'Ns, or .EARIBAUL'I, MINItnsoTA, 'A's's'IGNoR'or'TIIIRTYTIVE' oun- ItUNnREnT is To one ItBooseLIs AND FIFTEEN O'NEHUNDREDTIIS To LUCIJS A. SMITH, BOTH OFFARIBAULT, MINNESOTA.

ARTIFICIAL TOOTH on CROWN AND FASTENING MEANS THEREFOR.

Application filed August" 24, 1922. Serial No; 584,115.

This invention relates to new and useful improvements in artificial teeth or crowns and fasteninganeans therefor.

This invention is particularly adapted to effect the replacement of extracted or decayed teeththat cannot be filled. For this purpose there are provided tooth bodies or crowns shaped to simulate various human teeth and preferably these Q artificial teeth are formed of porcelain. "Themeans of securing such teeth inplace is by way of a post and interlocking attachment made of metals commonly used in dentistry. Among the advantages residing in the employment of this novel tooth and fastening are the use of less metal and more porcelain; the use of a solidly constructed porcelain tooth instead of a thinly constructed tooth; the occlusal surfaces of the teeth may be of porcelain instead of gold in incisors, cuspids, bicuspid and molar teeth. Further the tooth may be accurately adapted to the root by grinding to effect an accurate union between the root of the tooth and the artificial body or crown;

" and, as the tooth is cemented to the post or pin, there is afforded an interchangeability and replaceability.

The object, therefore, of this invention is to provide an improved artificial tooth or crown and fastening means therefor.

Other objects of the invention will more fully appear from the following description and the accompanying drawings, and will be pointed out in the annexed claims.

In the accompanying drawings there has been disclosed a structure designed to carry out the objects of the invention but it is to be understood that the invention is not conlined to the exact features shown as various changes may be made within the scope of the claims which follow.

In the drawings:

Figure 1 is a view in front elevation of the novel post or pin;

Figure 2 is a vertical sectional view through the post shown in Figure 1 with a porcelain tooth or crown cemented thereto;

Figure 3 is a cross-sectional view on the line 33 of Figure 1;

Figure 4 is a plan view of a tooth or crown to show the recess provided in the tooth shown in Figure 2.

It is old in this art to implant posts in apertures drilled into the roots of natural "novel post as shown.

The novel form of post here shown is preferably of asuitable metal and is upwardly taperedin order to facilitate introduction of-the post 'into the dri'lledroot.

The post is provided with a longitudinally extending channel 17 within which the cement is received when the post is implanted in the root. The provision of this longitudinally extending channel and the reception of the cement therein successfully prevents subsequent rotation of the post about its longitudinal axis. Such post rotation is disadvantageous in that the occlusal surface of the tooth is moved out of proper position. Furthermore, the post is provided with a plurality of shoulders 18 toward the outer end of the post. Such shoulders are conveniently formed by successively cutting away portions of the post to provide individual tapered sections, each terminating in a shoulder. In the form shown in Figures 1 to 3 inclusive the outer end of the post has an integral collar 19. In the form there shown such collar is square and preferably two of its edges are provided with grooves 21. Each such groove 21 extends from a portion of one face along the angled junction with the other face and a short distance along such adjacent face. The outer end of the post terminates in a block 22. The form of this block is more particularly shown in the cross-sectional view, Figure 2, wherein the block 22 is shown outwardly tapered on two sides and is terminally provided with two opposed V-shaped abutments 23 and 24. The abutment 23 is preferably formed longer than the opposed abutment 24.

A tooth or crown which is adapted to be used with this novel post is provided with a recess suitably shaped to receive the post collar 19 and the abutments 23 and 24 therein. In Figure 2 there is shown such cemented assembly of post and crown. The base portion of the crown shown in Figure 4 is provided with a recess complementary to the post heretofore described. This crown 25 has an inwardly presented square recess 26 adapted to receive the correspondingly shaped collar 19 of the post while the median portion of the recess 26 is countersunk to provide the two V-shaped recesses 27 and 28. Recess 27 is deeper and is adapted to receive the longer abutment 23 of the post, while the recess 28 receives the relatively shorter abutment 2e. WVhile these recesses 27 and 28 in the base portion of the crown are symmetrical with respect to the outer end of the post they are slightly larger than the two abutments in order to receive the cement 29 whereby the crown is held on the post.

1 claim as my invention:

.l. The combination of a dental post having a longitudinal channel and a plurality of transverse corrugations, said post being adapted to be cemented in a recess, a collar on said post adjacent its outer end and adapted to he cemented within a suitably shaped socket in a crown or similar article,

a groove in the edge of the collar whereby cement may be received therein and the collar retentively held, and terminal abutments on said post adapted to be received and cemented within a socket in said crown.

2. The combination of a dental post having a longitudinal channel and a plurality of transverse corrugations, said post being adapted to be cemented in a recess, a collar on 'said post adjacent its outer end and adapted to be cemented within a suitably shaped socket in a crown or similar article, a groove in the edge 01 the collar whereby cement may be received therein and the collar retentively held, a depending substantially V-shaped abutment on said post adapted to be received and cemented Within a suitably shaped socket in said crown or similar article.

In witness whereof, I have hereunto set my hand this first day of August 1922.

ALFRED K. SIMMONS. 

